Glaze breaking tool for internalcombustion engines



Jufly W, 19511 J. KEISER 9 GLAZE BREAKING TOOL FOR INTERNAL-COMBUSTION ENGINES Filed April 10, 1950 IN V EN TOR.

JOHN A2755? Patented July 17, .1951

GLAZE BREAKING TOOL FOR INTERNAL- COBIBUSTION ENGINES John Keiser, Windsor, 0010.

Appiication April 10, 1950, Serial No. 154,959

1 Claim. 1

unglazed portions and simply slide over the glazed portions without wear.

The principal object of this invention is to provide a simple, rapid and highly efficient shop tool with which the glaze can be quickly and easily removed from the cylinder Walls.

Another object of the invention is to so construct the device that it can be mounted in the chuck of a conventional electric drill with which most shops are provided and to provide a device of this character in which the abrasive portions can be quickly and economically renewed.

A further object is to so construct the .device so that the amount of pressure applied to the cylinder walls during the glaze removing operation can be accurately regulated so as to prevent damage to the walls.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efliciency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a perspective view of the improved glaze breaking tool;

Fig. 2 is a vertical section therethrough, taken on the line 2-2, Fig. 3;

Fig. 3 is a cross section taken on the line 3-3, Fig. 1; and

Fig. 4 is an enlarged detail section taken on the line 4-4, Fig. 1.

The improved tool is mounted on a vertical shaft I0, the upper extremity of which is designed to be mounted in the chuck of a conventional electric drill. The latter extremity has a reduced diameter portion II which adapts it to smaller chucks and also acts to center it in the drill chuck. The lower portion, approximately the lower half, of the shaft II! is threaded throughout its length, as indicated at I2. The threaded portion I2 is grooved throughout its position against the adjusting nut It.

2 entire length to provide a longitudinal key way I3. A knurled adjusting nut It is threaded onto the portion I2 up to the upper extremity of the latter. A relatively short compression spring I5 is then fitted over the threaded portion I2 to a A first sliding collar I6 contacts the sprin I3 and a relatively long compression spring I! is fitted thereagainst. A second sliding collar I8 is then slipped over the threaded portion I2 against the spring I1 and is held in place by means of a terminal retaining nut I9.

The two collars I6 and I8 are slideable on the threaded portion I2 and each is provided with a key 3I which travels in the keyway I3 to prevent rotation of the collars on the shaft I0. The upper collar I6 is provided with three uniformly-spaced, radially projecting, perforated ears 20. The lower collar I8 is provided with three uniformly-spaced pairs of perforated ears 2 I.

A single toggle link 22 extends upwardly and outwardly from between each pair of ears 2|. A pair of toggle links 23 extend downwardly and outwardly from each side and each of the ears 20. The links 22 and 23 are similar in size and shape and are hingedly mounted on the respective ears by means of toggle pins 24. The lower extremities of the links of each pair of links 23 are positioned on opposite sides of the single links 22 and are hinged together by means of a hinge screw 25.

The hinge screws 25, also act to hingedly mount channel-shaped foot members 26 at the hinge point of each set of three links 22 and 23. The foot members 26 are constantly urged to a position parallel to the axis of the shaft I 0 by means of indented leaf springs 21. The springs 21 bear at their extremities against the foot members 26 and bear against the hinged extremities of the links 22 and 23 at their indented middles.

A clamping plate 28 is secured to one side of each of the foot members 26 by means of a pair of clamp screws 29. The plates 28 clamp flexible strips of emery cloth 30 in place. The emery cloth strips 30 extend outwardly between the strips 28 and the foot members 26 and bend sidewardly over the outer faces of the foot members. The outer edges of the emery cloth strips are unattached.

In use, the adjusting nut It is rotated to expand the toggle links 22 and 23 to bring the foot members 26 to a diameter slightly in excess of the diameter of the cylinder upon which the device is to be used. The device is then inserted in the cylinder by compressing the foot memadjusting nut I4. serves to contract the device as the adjusting nut bars 26 toward each other against the action of the short spring IS. The upper extremity of the shaft I0 is then mounted in the drill chuck and the entire device is rotated by the electric drill mechanism while being moved along the length of the cylinder being worked upon.

The short springs I5 constantly urge the abrasive surfaces outwardly against the cylinder wall and the degree of outward pressure can be accurately regulated through the medium of the The long spring I? simply I 4 is moved upwardly.

While a specific form of the improvement has been described and illustrated herein, it is to be understood that the same may be varied, within the scope of the appended claim, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

A glaze breaking tool for internal combustion engine cylinders, comprising: a shaft; a first nut threaded on one extremity of said shaft; a first collar slidable on said shaft and resting against said nut; a second collar slidable on said shaft and spaced from said first collar; a spring surrounding said shaft between said collars and acting to urge them apart; a plurality of toggle arms hingedly extending from each collar; hinge pins securing the extremities of the arms from one collar to the extremities of the arms from the other collar; an elongated foot member tiltably mounted at its middle on each hinge pin; spring means urging each foot member to a position parallel to the axis. of said shaft; a second nut threaded on said shaft adjacent said second collar; and a second spring compressed between said second collar and said second nut and urging the second collar toward the first collar, said second collar being biased 

